whats the average amount of books sold per author?

A first time author with their debut novel about a girl and her body odor issues?

Or Dan Brown? Nora Roberts? John Grisham?

There's quite a discrepancy between the two, I'm afraid, so there's no possible way to give an accurate answer to your question.
 
Depends on how popular the book is. J.K. Rowling gets more than Miki L. Williams. For example.
 
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